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Lesson Plan
Curated OER

Inscribed Angles

For Teachers 9th - 10th
Students calculate the inscribed angle of a triangle. In this geometry lesson, students identify the angle created by intersection of a triangle and a circle. They see the relationship between the arc and the angle.
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Lesson Plan
Curated OER

Hey! What Is Your Angle?

For Teachers 5th
Fifth graders create and classify straight, right, acute and obtuse angles. In this clever lesson, 5th graders utilize pretzel sticks to form different types of angles. Best of all, they get to eat them at the end!
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Lesson Plan
Curated OER

Working With Angles

For Teachers 4th - 5th
In this math worksheet, students collaborate with a "study buddy" or "coach" to learn whether an angle is acute, obtuse or right. Students follow the directions to go through the process of deciding what classification an angle has....
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Lesson Plan
Curated OER

Investigating a Point on an ANgles Bisector

For Teachers 7th - 9th
Students investigate points and angle bisectors. In this geometry lesson, students define angles, bisectors and perpendicular bisectors. They analyze angles and bisectors using Cabri software.
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Lesson Plan
Curated OER

Triangle Puzzler

For Teachers 5th - 8th
Students are introduced to some basic concepts of geometry. They explain that the definition of a triangle is a figure with three sides, three angles, and three points. Triangles can be named by using three points in their correct sequence.
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Worksheet
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Measuring and Classifying Angles

For Students 6th
In this measuring and classifying angles worksheet, 6th graders select the type of angle (acute, right, obtuse, straight) for 6 drawings, then use a protractor to measure each angle.
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Lesson Plan
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Similar Triangles

For Teachers 9th
Ninth graders find the height of every day objects using techniques learned through postulates that allow triangles in a problem to be similar. They calculate the length of a missing side and solve proportions.
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Lesson Plan
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Whatcha Gunna Do When the Hulkster's Measuring Too??

For Teachers 8th - 10th
Students measure using tools they have made. In this algebra lesson, students measure the height and distance using non-traditional measuring methods. They apply their findings to algebra and trigonometry properties of measurements.
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Lesson Plan
Curated OER

Angles in Art

For Teachers 5th - 9th
Students utilize their handheld and the Angles program to create a non-objective artwork. Images created by famous artists who have utilized angles in their art work are examined.
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Worksheet
Curated OER

Angles of Time

For Students 4th - 5th
In this angles of time worksheet, students draw an hour hand on a clock to represent given angles and show a time, then "write about it." Answers included on page 2.
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Lesson Plan
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Analyzing Body Angles

For Teachers 10th - 12th
Students investigate angles of polygons. In this geometry lesson, students identify the relationship between angles and the number of sides in a polygon. They differentiate between sumilarity anf congruence in angles and sides.
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Lesson Plan
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Making Parallel Lines

For Teachers 8th - 10th
Students differentiate between parallel and perpendicular lines. In this geometry lesson, students make conjectures and apply it to solve real life situations. They collect data and make predictions based on the data.
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Worksheet
Curated OER

Geometry

For Students 6th - 10th
In this geometry worksheet, students find the sum of angles, label angles, and more. Students complete 6 questions total on this worksheet.
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Worksheet
Curated OER

Angles and Parallel Lines

For Students 9th - 10th
In this geometry worksheet, students identify the different angles formed by cut parallel lines. They name the angles and find the measures of each. There are 24 questions.
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Lesson Plan
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The Sum of All Angles

For Teachers 7th - 10th
Young scholars add up the different angles using the angle addition postulate. In this geometry instructional activity, students differentiate between interior and exterior angles. They calculate the different angles for triangles and...
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Worksheet
Curated OER

Drawing Quadrilaterals

For Students 6th - 8th
In this math worksheet, learners draw quadrilaterals and also find the sums of the inner angles for each. They practice drawing rhombuses as unique quadrilaterals.
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Lesson Plan
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Sin, Cos and Tangent

For Teachers 9th - 10th
Students find the identity o sine, cosine and tangent. In this precalculus lesson, students solve and identify the different parts of a right triangle. They use the ratios of the Pythagorean Theorem to find the missing side or angle.
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Lesson Plan
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Obtuse Triangles

For Teachers 4th
Fourth graders explore obtuse triangles. For this geometry lesson, 4th graders make obtuse triangles with paper and scissors. They determine how to find the center of their triangle.
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Lesson Plan
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Measuring the Earth

For Teachers 10th - 11th
Students identify types of arcs and angles in a circle, find the measure of arcs and angles, and solve real world problems involving lengths of segments in circles, lengths, and areas.
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Lesson Plan
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How are Trig Ratios Used to Measure Triangle Sides

For Teachers 8th - 11th
Students identify the ratios of trig identities. In this geometry lesson, students solve the missing sides and angles of triangles using trig ratios. They relate the graphs and waves to real life scenarios.
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Lesson Plan
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Exploring Trigonometric Ratios

For Teachers 10th - 12th
Students calculate the different ratios using a right triangle. In this trigonometry lesson, students identify the sine, cosine and tangent of each side. They find the missing angles using the different ratios.
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Lesson Plan
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Rays and Angles

For Teachers 9th - 12th
Students view examples of a ray, opposite rays, collinear rays, angles, and straight angles. They discuss and demonstrate how to use a protractor and complete worksheet problems on rays and angles.
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Lesson Plan
Curated OER

Geometry of Exploration: Eyes Over Mars

For Teachers 4th - 8th
Students research how engineers and scientists generate linear and angular measurements with geometry to survey the Earth and Mars. They assess how geometric shapes affect navigation. A surveyor comes to the classroom and explains how he...
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Lesson Plan
Curated OER

Clockwise

For Teachers 2nd
Second graders investigate angles through this series of lessons. They determine how angles turn in both clockwise and anticlockwise directions. They examine the characteristics of quarter half turns and how they can begin from any...

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